Change away from extending ClauseVerifier for contracts which support clauses, and explicitely call
clause verification code in the verify() function. This should make the flow of control easier to understand.
Changes include:
- LedgerTransaction is now much more central: it represents a fully resolved and looked-up tx, with the inputs available.
- TransactionGroup and TransactionForVerification are gone. There is a temporary TransactionForContract class for backwards
compatibility but it will also be gone soon.
- ResolveTransactionsProtocol is simplified, and now commits a tx to the database as soon as it's determined to be valid.
- ServiceHub is now passed in more consistently to verification code, so we can use more services in future more easily e.g. a sandboxing service.
- A variety of APIs have been tweaked or documented better.
This change reduces the testing confusion that can occur when cash is issued by one of the parties in a transaction rather than e.g. a neutral third party like a central bank.
* Merge common code between Cash and CommodityContract into OnLedgerAsset
* Move spend/exit tx generation logic into the clauses
* Add generateExit() function for Obligation
1. Function for converting raw entropy into an EDDSA key pair. This is useful for unit tests when you don't want a random key but would rather be able to identify it from the logs by eyesight, and will be useful later also when implementing deterministic key derivation.
2. Function that can format any collection of public keys using the bitcoin-style base58 form.
3. A dummy NullSignature object, again, useful for tests when you don't want to provide a real signature.
Then set a handful of dummy unit testing keys to predictable/fixed values.
The obligation `Settle` command takes in an amount to be settled, but only uses the underlying token from it.
This enforces that the settled amount matches the value seen moving.
- Move code out of ambiguously named TestUtils files (there were three). Sometimes it's simpler to just put these things into the contract source files directly.
- Remove JavaTestHelpers objects (there were three), in favour of just giving the top level kotlin file class better names.
- Misc other small tweaks and cleanups.
As the timestamping authority is now always the notary service, contracts should
no longer be using name-based lookup of the timestamping authority (as this will
generally be wrong). This introduces a new "timestamp" property on a transaction,
and updates most contracts to refer to it.
In some cases (IRS, CommercialPaper) there are transactions with no input states
to derive notary from, that use timestamps. In these cases a notary is specified
in the command.
